395 
The incisive teeth are of the common wedge-like form, and are six 
in number, which is the exact number of those of the tapir, with 
which they also very nearly agree in their forms. 
In the fossil specimens of the upper jaw are also the corresponding 
number of six incisors ; behind which is the upper canine tooth, which 
does not project any more than that of the tapir or pecari. Behind 
this tooth is a small space for the reception of the point of the canine 
tooth of the lower jaw. 
The upper grinders have their crown nearly square, and have four 
roots, whilst those of the lower have but two : the foremost only are 
a little narrower in proportion than the others. 
The outer face inclines obliquely inwards as it descends, and is di- 
vided by three longitudinal ridges, into two concavities, rounded to- 
wards the root, and terminating in a point towards the grinding sur- 
face. By the angles thus formed, a line results at the outer edge of 
the grinding surface, in the shape of a W ; and from the inclination 
and the concavities on the external surface results another line in the 
form of a W, in the horizontal direction. In these teeth, then, are 
the same squareness of form, the longitudinal ribs on the external face, 
and the same line in the shape of a W, as in the upper grinders of the 
rhinoceros ; but the distribution of the risings and depressions on the 
grinding surface, and of the enamel, is essentially different. 
Plate XXL Fig. 4, represents the outer surface of the fourth molar 
tooth of the lower jaw of P. medium ; and Fig. 5, represents its inner 
surface. Fig. 6 is the outer surface ; and Fig. 7 is the inner surface 
of one of the molares of the upper jaw of the same animal. 
Thus Cuvier has been able to determine, that in the gypsum there 
exist the remains of an animal which had twenty-eight grinding teeth, 
twelve incisive, and four canine. The lower grinders formed in two 
or three simple crescents, and the upper square, with many markings 
on their crown : the canine teeth not passing out of the mouth. It 
appears also that this animal must, from the number of its teeth, have 
